Heat-Treated TiO{sub 2} Plasma Spray Deposition for Bioactivity Improvement in Ti-6Al-4V Alloy
In the present study, titanium di-oxide (TiO{sub 2}) coating has been developed on Ti-6Al-4V substrate by plasma spray deposition. Followed by plasma spraying, heat treatment of the sprayed sample has been carried out by isothermally holding it at 823 K (550 °C) for 2 h. Microstructural analysis shows the presence of porosity and unmelted particles on the as-sprayed surface, the area fraction of which reduces after heat treatment. X-ray diffraction analysis shows the phase transformation from anatase (in precursor powder) to rutile (in as-sprayed coating and the same after heat treatment). There is an improvement in nano-hardness, “Young’s modulus” and wear resistance in plasma-sprayed TiO{sub 2} coating (as-sprayed as well as post-heat-treated condition) as compared to as-received Ti-6Al-4V, though post-heat treatment offers a superior hardness, “young’s modulus” and wear resistance as compared to as-sprayed coating. The corrosion behavior in “hank’s solution” shows decrease in corrosion resistance after plasma spraying and post-heat treatment as compared to as-received substrate. A significant decrease in contact angle and improvement in bioactivity (in terms of apatite deposition) were observed in TiO{sub 2}-coated surface as compared to as-received Ti-6Al-4V.
- OSTI ID:
- 22860719
- Journal Information:
- Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 12 Vol. 26; ISSN 1059-9495; ISSN JMEPEG
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AFTER-HEAT
ALUMINIUM COMPOUNDS
CORROSION RESISTANCE
HARDNESS
HEAT TREATMENTS
MICROSTRUCTURE
PHASE TRANSFORMATIONS
PLASMA
SPRAY COATING
SPRAYED COATINGS
SPRAYS
SUBSTRATES
SURFACES
TERNARY ALLOY SYSTEMS
TITANIUM ALLOYS
TITANIUM OXIDES
VANADIUM COMPOUNDS
WEAR RESISTANCE
X-RAY DIFFRACTION